Image authentication for permissible cropping

Abstract

In a digital society, it is not easy to achieve a balance between privacy and authentication. Privacy requires some modifications of the original image and signed data, but image authentication needs to ensure its integrity as much as possible. The most common method of privacy protecting is deleting some sensitive data in the original data. In this paper, we propose a practical scheme of image authentication for permissible cropping operation, using a textbook RSA signature scheme and a message commitment scheme. The security of our scheme is implied by the security of underlying cryptographic primitives. Experimental results show that the proposed scheme is practical and can be embedded in some on-line systems.